# Fame.am profile — machine-readable export
# Canonical URL: https://fame.am/person/ludolph-van-ceulen
# Generated: 2026-08-31T17:36:45.628Z

schema: https://schema.org/Person
url: "https://fame.am/person/ludolph-van-ceulen"
name: "Ludolph van Ceulen"
slug: "ludolph-van-ceulen"
description: "A German-Dutch mathematician who spent much of his life computing pi by hand to 35 decimal places — a record that held for decades and earned the constant a name in his honor."
tagline: "German-Dutch mathematician (*1540 – †1610)"
image: "https://commons.wikimedia.org/wiki/Special:FilePath/Portret_van_Ludolph_van_Ceulen%2C_RP-P-OB-15.347.jpg"
gender: "male"
country:
  name: "Germany"
  isoCode: "DE"
category:
  name: "Academics"
  slug: "academics"
profileType:
  name: "Academic"
  slug: "academic"
  entityType: "https://www.wikidata.org/entity/Q39631"
birthDate: "1540-01-28"
deathDate: "1610-12-31"
livingStatus: "DECEASED"
scores:
  popularity:           53.62
  momentum:             2.45260663507109
  historical:           21.875672
  currentAttention:     0
  sourceConfidence:     60
  profileCompleteness:  70
  trendDirection:       "FALLING"
ranks:
  global:   null
  country:  null
  category: null
tags:
  - name: "Scientists"
    slug: "scientists"
  - name: "Academic"
    slug: "academic"
  - name: "Mathematics"
    slug: "mathematics"
  - name: "Germany"
    slug: "germany"
  - name: "Europe"
    slug: "europe"
  - name: "Early Modern Era"
    slug: "early-modern-era"
sources:
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    title: "Wikipedia"
    type:  "WIKIPEDIA"
  - url: "https://www.wikidata.org/wiki/Q310771"
    title: "Wikidata"
    type:  "WIKIDATA"
  - url: "https://pantheon.world/profile/person/Ludolph%20van%20Ceulen"
    title: "Pantheon 2.0"
    type:  "DATABASE"
  - url: "https://az.wikipedia.org/wiki/Ludolf_van_Seylen"
    title: "Ludolf van Seylen"
    type:  "WIKIPEDIA"
  - url: "https://bg.wikipedia.org/wiki/%D0%9B%D1%83%D0%B4%D0%BE%D0%BB%D1%84_%D1%84%D0%BE%D0%BD_%D0%A6%D0%BE%D0%B9%D0%BB%D0%B5%D0%BD"
    title: "Лудолф фон Цойлен"
    type:  "WIKIPEDIA"
  - url: "https://bs.wikipedia.org/wiki/Ludolph_van_Ceulen"
    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
  - url: "https://ca.wikipedia.org/wiki/Ludolph_van_Ceulen"
    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
  - url: "https://cs.wikipedia.org/wiki/Ludolph_van_Ceulen"
    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
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    title: "Ludolph van Ceulen"
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    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
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    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
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    title: "لودولف فان کویلن"
    type:  "WIKIPEDIA"
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    title: "Ludolph van Ceulen"
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    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
  - url: "https://gl.wikipedia.org/wiki/Ludolph_van_Ceulen"
    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
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    title: "לודולף ואן צאולן"
    type:  "WIKIPEDIA"
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    title: "Ludolph van Ceulen"
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    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
  - url: "https://hy.wikipedia.org/wiki/%D4%BC%D5%B8%D6%82%D5%A4%D5%B8%D5%AC%D6%86_%D5%BE%D5%A1%D5%B6_%D5%94%D5%B5%D5%B8%D5%AC%D5%A5%D5%B6"
    title: "Լուդոլֆ վան Քյոլեն"
    type:  "WIKIPEDIA"
  - url: "https://id.wikipedia.org/wiki/Ludolph_van_Ceulen"
    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
  - url: "https://it.wikipedia.org/wiki/Ludolph_van_Ceulen"
    title: "Ludolph van Ceulen"
    type:  "WIKIPEDIA"
  - url: "https://ja.wikipedia.org/wiki/%E3%83%AB%E3%83%89%E3%83%AB%E3%83%95%E3%83%BB%E3%83%95%E3%82%A1%E3%83%B3%E3%83%BB%E3%82%B3%E3%83%BC%E3%83%AC%E3%83%B3"
    title: "ルドルフ・ファン・コーレン"
    type:  "WIKIPEDIA"
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    title: "뤼돌프 판 쾰런"
    type:  "WIKIPEDIA"
  - url: "https://la.wikipedia.org/wiki/Ludolphus_van_Ceulen"
    title: "Ludolphus van Ceulen"
    type:  "WIKIPEDIA"
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    title: "Лудолф ван Цојлен"
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    title: "لودولف فان ساولن"
    type:  "WIKIPEDIA"
  - url: "https://azb.wikipedia.org/wiki/%D9%84%D9%88%D8%AF%D9%88%D9%84%D9%81_%D9%81%D8%A7%D9%86_%DA%A9%D9%88%DB%8C%D9%84%D9%86"
    title: "لودولف فان کویلن"
    type:  "WIKIPEDIA"

# bio (long form, separated for readability)
bio: |
  Born in Hildesheim on 28 January 1540, Ludolph van Ceulen devoted years to the painstaking calculation of the mathematical constant pi, using geometric methods to push accuracy far beyond what anyone had achieved before. His work yielded 35 digits, a feat so remarkable that pi became known in parts of Europe as the Ludolphine number. The achievement stood as a benchmark of human patience and precision until newer techniques eventually surpassed it. He died on 31 December 1610, having turned a single irrational number into a monument.